Exhaust emission purifying apparatus for engine

Details Exhaust emission purifying apparatus for engine Exhaust emission purifying apparatus for engine

2010-06-03

2010-11-30

Stoner, Kiley (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C423S235000, C060S286000, C060S283000, C060S285000, C060S301000, C073S053010, C073S061760

Reexamination Certificate

active

07842267

ABSTRACT:
A technology for purifying an exhaust emission from an engine is provided, in which a misjudgment caused by a time lag between the abnormality detection and an abnormality judgment is avoided, in the case where a plurality of abnormalities is judged on the aqueous solution of a reducing agent or the like. After a first abnormality judgment (Femp=1: the time t2) is made, when a second abnormality is detected as a result that the concentration Dn as a state parameter is directly shifted from a first region A to a second region C (the time t3), the first abnormality judgment is maintained for a predetermined period of time PRD after the second abnormality detection.

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